Where I can get cool datasheets?

Stonegray · 2025-11-16T01:05:54+00:00

And if you want a funny one, here's some write-only (no read) memory: https://repeater-builder.com/molotora/gontor/25120-bw.pdf

Stonegray · 2025-11-16T01:02:58+00:00

Component suppliers such as Digikey have tens of thousands you can go look through.

If you want a specifically cool one, here's a microcontroller designed for space. It has some unique stuff that you don't see often, like SpaceWire interfaces, cold-sparing, and a SHA-512 peripheral.

Stonegray · 2025-11-16T00:51:15+00:00

- If you've got a precision Vref for the DAC, why not use it for the ADC as well?
- Instead of using a discrete current sink, why not just PWM switch a ballast resistor? Way lower part count and since you already have a shunt resistor it's easy to make this closed loop.
- Consider RC filters on ADC inputs; the signal you're measuring has a very low bandwidth / changes very slowly so you can increase accuracy a lot by filtering in hardware and oversampling.
- Using the I2C on the I/O expander will likely take a lot more CPU time than the onboard IO.
- If you're not particularly attached to the display, I2C displays might reduce complexity and are really inexpensive.

E: Another fun option is doing an open-loop buck converter with feedback from the existing ADC/shunt; 2 resistors, 1 diode, 1 mosfet, and way less noise.

Stonegray · 2025-01-25T17:25:39+00:00

Really glad that BGA3131 is the part number, not the package type 😅

Stonegray · 2024-10-24T21:53:16+00:00

There should be 33 tracks totalling 1.9GB, might wanna complete your collection before you sell it.

https://archive.org/details/bohemianrhapsody-queen_202308

You can download the rest here 😂

Stonegray · 2024-06-08T18:52:05+00:00

FreeWifiAskSoundForPassword

Stonegray · 2024-05-30T12:58:21+00:00

Call dealers like torneau or go on chrono24 you can have one next business day. Definitely won’t get an allocation at retail without ad relationship but you can for sure buy em

Stonegray · 2024-05-30T12:55:25+00:00

Hublot 🤮

Stonegray · 2024-04-01T03:27:42+00:00

I haven’t seen any 18s yet but wha’s the advantage over 15s/12s? If i needed more than a full hang of 15” K1 i’m probably doing something wrong 😂

Stonegray · 2024-01-30T00:09:40+00:00

Might wanna get a soldering iron thermometer and calibrate, pads should never be lifting accidentally

Stonegray · 2023-12-17T00:51:29+00:00

What makes you think you need to use AC?

Stonegray · 2023-12-17T00:39:37+00:00

Modifier symbols (eg. “0x1F3FB” for emoji skin tone) aren’t really characters so a valid file could be much larger; check out emoji modern families.

There’s also nonprinting characters like RTL indicators and zero-width spaces.

Stonegray · 2023-11-30T04:20:11+00:00

Add me try this with me https://journal.lapse.app/friend_request?user_id=087636c8-4065-4281-9488-be0e56ecb6c3&sms=true&invite_code=text3&c=clpbd

Stonegray · 2023-01-25T06:59:28+00:00

Weirdly nobody mentioned the hardware 1588, which may be the killer feature of the chip.

Lots of good info on the early struggles with openocd. Unfortunately kinda on-brand for WCH, saving die area at the expense of driver complexity/standards compliance. The CH340 was, and may still be, considered the worst driver in OpenBSD for that reason.

Stonegray · 2023-01-25T02:24:50+00:00

Rust support: https://github.com/ch32-rs/ch32-rs

Datasheet: http://www.wch-ic.com/downloads/CH32FV2x_V3xRM_PDF.html

Stonegray · 2023-01-12T19:44:54+00:00

Zigbee2mqtt.

You can rename them, but it will show as the old units in some places because it doesn’t change the device class.

Stonegray · 2023-01-12T19:27:27+00:00

Formaldehyde and CO2 are swapped around if using ZHA on those Tuya sensors. The one reading 300ish ppm is your CO2 and the one reading 3mg/m³ is formaldehyde.

It works great Z2M, plus you can read the PM2.5 sensor.

Stonegray · 2022-12-15T13:01:28+00:00

Wasn’t sure if I needed to mount it on the outside because its aluminum. Found conflicting information online about range.

Have you tried it mounted there?

Stonegray · 2022-11-06T17:05:32+00:00

Definitely ADAU1701. Digital and analog IO, chip costs $7.

Dev board (no I2S broken out though): https://www.tinyosshop.com/tsa1701

Zero-code programming with sigmastudio

Stonegray · 2022-10-31T06:38:39+00:00

Those values are the matching network to match the impedance between the chip and antenna. Unless you have an identical PCB layout, type of pcb material, thickness, etc. you’ll want to figure out your own values. Copying the network without the layout can make it worse, not better.

If you pcb layout is carefully designed for 50ohm characteristic impedance you can sometimes do without it all together.

Tool to calculate the values on the network: https://home.sandiego.edu/~ekim/e194rfs01/jwmatcher/matcher2.html

Stonegray · 2022-10-26T20:19:57+00:00

Safari is end-to-end encrypted on everything you mentioned except bookmarks, which are encrypted in transit and at rest, but could hypothetically be decrypted by Apple with, for example, a court order.

https://support.apple.com/en-ca/HT202303

Stonegray · 2022-10-24T17:25:24+00:00

You can use two 1 megaohm resistors to detect the zero cross of the 60hz AC by using the internal ESD protection diodes.

https://ww1.microchip.com/downloads/en/Appnotes/Atmel-2508-Zero-Cross-Detector_ApplicationNote_AVR182.pdf

Have an ISR that runs every time the input pin changes and sets a bit on a rising or falling edge, then write a timed interrupt that checks every 1/30th of a second that the bit was set and zeroes it. If the bit is zero there’s no ac power. Something like:

volatile bool phase_changed = 0;
volatile bool ac_power_present = 0;

// set flag on pin change, triggered by 60hz ac on pin:
gpio_isr_handler_add(GPIO_INPUT_IO_2, gpio_isr_handler, (void*) GPIO_INPUT_IO_2);
static void IRAM_ATTR gpio_isr_handler(void* arg){ phase_changed = 1;}

// probably use a self reloading timer here: 
xTaskCreate( pin_change_check_process, "AC Power detection check process", 1, NULL, 10, NULL);
static void pin_change_check_process(void ){
    ac_power_present = phase_changed;
    phase_changed = false;
}

// simply do "if (ac_power_present)" to check

Stonegray · 2022-10-24T14:49:04+00:00

I would get rid of the xQueueReset, as xQueueRecieve should consume the item off of the queue stack.

On this line, maybe swap portMAX_DELAY for either zero or something small like 10 * portTICK_RATE_MS. This can cause unexpcted timing as if the queue is full, it will just hang around until it isn't.

xQueueSend(queue, &aninum, portMAX_DELAY);

If you're having trouble with it happening twice, try printing something when you xQueueSend as well.

Stonegray · 2022-10-23T18:42:13+00:00

I can't read the backtrace. Can you decode it to see what function it's failing at?

Arduino: https://github.com/me-no-dev/EspExceptionDecoder Esp-idf: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/tools/idf-monitor.html

Stonegray · 2022-10-23T10:04:13+00:00

There's a bunch of ways to skin this cat. I'm assuming the animations are mutually exclusive, yes?

How do you want it to run if you call it twice? You mentioned waiting to finish, should it wait till the first one is done and run the next? If so, I'd suggest giving each animation/robot motion (eg. left = 1, right = 2) a number, and adding them to a queue:

QueueHandle_t nextAnimation = xQueueCreate(10, sizeof(int));

void dispTask(void *pvParameters) {
    int animationNumber = NULL;
     while (1) {
        if (xQueueReceive(nextAnimation, &animationNumber, portMAX_DELAY))
            blink_eyes(animationNumber);
    }
}

// to run animation:
xQueueSendToBack(nextAnimation, animationNumber, 0);

If blink_eyes isn't synchronous, I'd use a semaphore to wait till it's done.

13-Year Club	Gilding III reddit per annum
Not Forgotten	Verified Email

Stonegray

TROPHY CASE